What is a Bradenhead?
Definition of bradenhead
: a casing head in an oil well having a stuffing box packed (as with rubber) to make a gastight connection.
What is Bradenhead pressure?
Bradenhead pressure, or sustained casing pressure, is pressure build up in the annular space between the surface casing and the next smaller diameter casing string within the wellhead.
What is a Braden head squeeze?
A process used to repair a hole in the casing by pumping cement down tubing or drill pipe. First, the casinghead, or bradenhead, is closed to prevent fluids from moving up the casing. Then the rig’s pumps are started.
Why squeeze cementing is used?
The forcing, by pressure, of cement slurry into a specified location in a well, such as channels or perforations, for the purpose of achieving zonal isolation. Squeeze cementing is a remedial cementing technique used to repair flaws in primary cement or damage incurred by corrosive fluids.
What is Bradenhead testing?
Wellbore Diagram Bradenhead tests are intended to evaluate shut-in pressures and blowdown characteristics of all annular spaces in a well.
What is a cement squeeze job?
Squeeze job, or squeeze cementing is a term often used in the oilfield to describe the process of injecting cement slurry into a zone, generally for pressure-isolation purposes.
What is a squeeze job in the oilfield?
1. n. [Well Workover and Intervention] An operation that requires the careful application of pump pressure to force a treatment fluid or slurry into a planned treatment zone. In most cases, a squeeze treatment will be performed at downhole injection pressure below that of the formation fracture pressure.
What is a block squeeze?
“Block” squeezing is the process of squeezing off permeable sections above and below a production zone, which requires isolation of the zone with a packer and retainer, using high pressure to force cement slurry (fracture) into the zone.
What is squeeze operation?
What is hesitation squeeze?
1. n. [Well Workover and Intervention] A technique used in squeeze cementing whereby a portion of the slurry is pumped, then pumping stops to expose the slurry to differential pressure against the zone of interest in stages over a period from several minutes to several hours.
What is a cement stinger?
Tubing with a smaller diameter than the drillpipe is commonly run on the bottom of the drillpipe for setting a balanced plug; this smaller diameter tubing is commonly known as the stinger. Using a stinger lowers the height of the cement plug with the pipe in place, prior to pulling out of hole (POOH).
What is squeeze cementing?
Squeeze cementing is a dehydration process. A cement slurry is prepared and pumped down a wellbore to the problem area or squeeze target. The area is isolated, and pressure is applied from the surface to effectively force the slurry into all voids.
What is scale squeeze treatment?
Squeeze treatments consist of the batch injection of a chemical scale inhibitor (SI), which above a certain concentration, commonly known as MIC (Minimum Inhibitor Concentration), prevents scale deposition.
What is a cement retainer?
What is a cement retainer? An isolation tool set in the casing or liner that enables treatments to be applied to a lower interval while providing isolation from the annulus above. Cement retainers are typically used in cement squeeze or similar remedial treatments.
What is a squeeze in the oil field?
1. n. [Well Workover and Intervention] The careful application of pump pressure to force a treatment fluid or slurry into a planned treatment zone. In most cases, a squeeze treatment will be performed at downhole injection pressure below that of the formation fracture pressure.
What is a cement squeeze in oil and gas?
1. n. [Well Completions] A remedial cementing operation designed to force cement into leak paths in wellbore tubulars. The required squeeze pressure is achieved by carefully controlling pump pressure.
What is a bridge plug in the oilfield?
1. n. [Perforating, Well Completions] A downhole tool that is located and set to isolate the lower part of the wellbore. Bridge plugs may be permanent or retrievable, enabling the lower wellbore to be permanently sealed from production or temporarily isolated from a treatment conducted on an upper zone.
What does it mean to squeeze an oil well?
Man with a drill. A squeeze job is a term that refers to a repair made to an oil well. A cement slurry, which is typically a mix of cement, water, and fine sand, is pumped into a casing or pipe that has been cracked or otherwise damaged.
What does a scale inhibitor do?
Scale inhibitors (SIs) are a class of specialty chemicals that are used to slow or prevent scaling in water systems. Oilfield scaling is the precipitation and accumulation of insoluble crystals (salts) from a mixture of incompatible aqueous phases in oil processing systems.
What are scale deposits?
Scale deposits are a typical indicator of hard water.
Dissolved calcium and magnesium salts are primarily responsible for most scaling in pipes and water heaters and cause numerous problems in laundry, kitchen, and bath. Hardness is usually expressed in grains per gallon (or ppm) as calcium carbonate equivalent.
What is a scale squeeze?
In a scale-inhibitor squeeze, the inhibitor is pumped into a water-producing zone. The inhibitor is attached to the formation matrix by chemical adsorption or by temperature-activated precipitation and returns with the produced fluid at sufficiently high concentrations to avoid scale precipitation.
How do bridge plugs work?
Bridge Plugs are downhole tools composed of slips, mandrel and an elastomer sealing element. It is run in hole and set in casing to isolate a lower zone from an upper zone. It may be installed to permanently seal a well or installed temporarily to preform work on the well.
What is the difference between cement retainer and bridge plug?
The difference between each tool is that the TAM Cement Retainer allows the operator to cement through the tool, and the TAMPLUG is strictly a bridge plug.
How long does a scale inhibitor last?
As rule of thumb scale inhibitors have short lifespans. Usually inhibitors last around 5 years with the longest-lived lasting up to 10 years.
How do you soften hard water naturally?
Boiling water is certainly one of the most effective ways to soften it. The boiling will have the effect of draining the hard water minerals to the bottom, like calcium and magnesium.